issue with sscanf and comparing number

Question

I need help. My program is starting with: ./proj --tan 1.024 6 10 I count tangens through Taylor' s polynom. Range of iteration is 1 to 13. I need to stop program if nuber of iteration is higher then 13, but my code below don't work.

if ((sscanf(argv[3], "%d", &n) >= 14) || (sscanf(argv[3], "%d", &n) < 0)) { return ERROR_WRONG_NUM; } if ((sscanf(argv[4], "%d", &m) >= 14) || (sscanf(argv[4], "%d", &m) < 0)) return ERROR_WRONG_NUM;

sscanf returns the number of items that were successfully scanned, not the value that was scanned. You should call sscanf once, and then compare if (n >= 14 || n < 0). — barak manos
– barak manos, Commented Nov 26, 2014 at 7:39

user3386109 · Accepted Answer · 2014-11-26 07:46:35Z

The return value of sscanf is the number of input items assigned, or EOF when failed, which is not what you expected.

You should compare n with the range [1,13] after checking the return value from sscanf

items = sscanf( argv[3], "%d", &n ); if ( items != 1 || n < 1 || n > 13 ) return ERROR_WRONG_NUM;

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